There are numerous rules regarding distance, obstructions etc. I prefer a
simpleir test method, take a healthy young volunteer who works in the lab.
Familiarize them with the locations of the fountains. Place them in a bench
position in which they may work and be exposed to eye hazards. Blindfold
them. Tell them to find their way to the shower in 30 seconds or less. If they
fail this test evaluate the positioning of the shower.

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